Fluorine-Containing Butanolides and Butenolides. Vinylic Fluorine Displacement in 4,4-Dialkyl-2,3-difluoro-2-buten-4-olides and a Novel Rearrangement Induced by Organolithium Addition to a Carbonyl Group
作者:Oldřich Paleta、Andrew Pelter、Josef Kebrle、Zdeněk Duda、Jan Hajduch
DOI:10.1016/s0040-4020(00)00167-8
日期:2000.5
3-substituted derivatives (4–24). Softer Grignard reagents in the form of a copper (I) bromide-dimethyl sulfide complex reacted in the same way as O-nucleophiles to afford 3-alkyl- or 3-aryl derivatives (25–26). Harder organolithium reagents attacked the carbonyl group to give unstable hydroxy compounds that rearranged spontaneously to furan(2H)-3-ones (27–29) in a novel oxygen rearrangement reaction.
2,3-二氟-4,4-二甲基-2-丁烯-4-油酸酯(1)和螺环的2,3-二氟-4,4-(戊烷-1,5-二基)-2-丁烯-4-通过用一些O-和C-亲核试剂对氟进行乙烯基置换,可以改性乙交酯(2)。钠和锂的醇盐,取代的酚盐和受保护的葡萄糖醇盐通过1,4-加成反应,随后排出氟离子,生成3取代的衍生物(4-24)。溴化铜(I)-二甲基硫醚复合物形式的较软格氏试剂以与O-亲核试剂相同的方式反应,生成3-烷基-或3-芳基衍生物(25-26)。较硬的有机锂试剂会攻击羰基,从而生成不稳定的羟基化合物,该羟基化合物会自发重排为呋喃(2 H)-3-ones(27 – 29)进行新型的氧气重排反应。